Comparison

CMC Field Guide vs MyUSNG

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CMC Field Guide

Access rope rescue and access diagrams, reference charts, and how-to information instantly in the field. This free app provides essential rescue references, allows for note-taking, and supports offline access to downloaded content.

Highlights
  • Rope rescue and access diagrams
  • Reference charts
  • How-to information
  • Bookmark and take notes
  • Offline access to downloads
  • Browse equipment and tutorials
Features
Read full description

This free App allows quick access to rope rescue and access diagrams, reference charts, how-to information, and rescue references, all from the palm of your hand while out in the field. It's packed with reference charts, diagrams, and how-to information. With the CMC Field Guide App you can: Access rescue references instantly Bookmark and take notes on your favorite sections Download videos, guides, and manuals for offline use Browse equipment and information, tutorials, and product user manuals **Note** Updating this App will give you access to all of the functionality built into the most recent version of the App. Your saved information including Notes, References, and Attachments, will be carried through into the updated version.

About

MyUSNG

This app reports your device's location in US National Grid format. Easily copy your USNG coordinates to your clipboard with a single tap, or email them with a tap and hold. It also features a map to capture and view USNG locations.

Highlights
  • USNG location reporting
  • One-tap copy to clipboard
  • Tap-and-hold email function
  • Map view for location capture
  • USNG information resource
Read full description

MyUSNG reports the location of your device in US National Grid format (USNG). With a single tap on the screen, you will copy the USNG location into your clipboard. With a tap and hold, you can easily e-mail your USNG location. MyUSNG also includes a simple map that will let you capture the USNG of locations away from you, or center the map The United States National Grid (USNG) is a nationally consistent language of location in a user friendly format. USNG is commonly used during Search and Rescue operations in the United States. For more information about USNG visit usngcenter.org. MyUSNG is an Esri Labs project and not an official Esri product. MyUSNG is provided on an as-is-basis and you assume all risks associated with using this app.

Screenshots

CMC Field Guide3 screens
MyUSNG3 screens

Verdict

The call

The clearest difference is rating: MyUSNG at 4.4 against CMC Field Guide's 4.0. MyUSNG also leads on review sentiment (100% vs 78%) and iOS requirement (11.0 vs 15.1). CMC Field Guide's advantage is update cadence (every 3 months vs every 10 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

MyUSNG holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 24 and 9 respectively. Written reviews point the same way: 78% of CMC Field Guide's written reviews are positive against 100% of MyUSNG's.

UpkeepUpdate frequency

CMC Field Guide ships an update every 3 months, MyUSNG every 10 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
CMC Field Guide versus MyUSNG: the parameters behind the verdict, then further details
ParameterCMC Field GuideMyUSNG
PriceFreeFree
Rating4.0 (24 ratings)4.4 (9 ratings) — better
Positive reviews77.8% of reviews100.0% of reviews — better
Number of ratings24 — better9
Update frequencyEvery 3 months — betterEvery 10 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.111.0 — better
Further details — not scored
Size36 MB30 MB
Age rating4+4+
DeveloperCMC Rescue, Inc.Esri Online LLC

Customer experience

CMC Field Guide

All ratings24 ratings
Positive66.7%
Neutral20.8%
Negative12.5%
Written reviews63 reviews
Positive77.8%
Neutral3.2%
Negative19.0%

MyUSNG

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

CMC Field Guide

Reported bugs

15 issues
  • App crashes before it opens
  • Unable to go beyond the first page
  • Unable to access after updating
  • App crashed twice
  • Some links in the app don't work
Show 10 more
  • Multiple glitches where pages cannot be opened
  • Cannot open the app after update
  • New upgrade crashes on opening items
  • Could not find page all the time
  • App doesn't open
  • Half the tabs disappear
  • Barely works (can rarely get into any of the pages)
  • Add-on pop up when viewing PDF
  • Poor display quality - not useful for reading
  • Only M/A illustration shown is 1:1 after update

Requested features

2 requests
  • Enable landscape mode
  • Update with latest techniques

MyUSNG

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

CMC Field Guide

No in-app purchases

None

MyUSNG

No in-app purchases

Questions

Is CMC Field Guide free?
CMC Field Guide is free to download, with no in-app purchases.
Is MyUSNG free?
MyUSNG is free to download, with no in-app purchases.
Which has better reviews, CMC Field Guide or MyUSNG?
MyUSNG is rated higher. CMC Field Guide averages 4.0 out of 5 from 24 ratings, while MyUSNG averages 4.4 from 9 ratings.
Do CMC Field Guide or MyUSNG have ads?
Neither CMC Field Guide nor MyUSNG shows ads.
Which is updated more often, CMC Field Guide or MyUSNG?
CMC Field Guide ships an update every 3 months, and MyUSNG every 10 months. Most recently, CMC Field Guide was updated on October 23, 2026 and MyUSNG on October 24, 2026.

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